/
system.go
193 lines (169 loc) · 5.14 KB
/
system.go
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package businesslayer
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"time"
"github.com/arizon-dread/status-checker-api/datalayer"
"github.com/arizon-dread/status-checker-api/models"
)
// make it mockable
var dlGetSystemStatus = datalayer.GetSystemStatus
func GetSystemStatus(id int) (models.Systemstatus, error) {
var err error = nil
system, err := dlGetSystemStatus(id)
seconds := 30
client := &http.Client{Timeout: time.Duration(seconds) * time.Second}
var transport *http.Transport = http.DefaultTransport.(*http.Transport)
if err != nil {
fmt.Printf("DataLayer returned error: %v when trying to get system from database\n", err)
//fail
} else {
if strings.Contains(system.CallUrl, "https") {
//cert-check
certErr := checkCert(&system)
//use clientcert in call
if certErr == nil {
if system.ClientCertID != nil {
tlsConfig, tlsErr := getTlsConfigWithClientCert(system)
if tlsErr == nil {
transport.TLSClientConfig = tlsConfig
client.Transport = transport
} else {
fmt.Printf("Failed creating tls client config, %v\n", tlsErr)
}
}
}
}
var callErr error = nil
if system.CallBody != "" {
//POST
contentType := getContentType(system.CallBody)
resp, err := client.Post(system.CallUrl, contentType, strings.NewReader(system.CallBody))
callErr = blHandleResponse(&system, resp, err)
} else {
//GET
resp, err := client.Get(system.CallUrl)
callErr = blHandleResponse(&system, resp, err)
}
if callErr != nil {
sendAlert(&system, fmt.Sprintf("%v", callErr))
} else {
system.Status = "OK"
}
createdSys, err := dlSaveSystemStatus(&system)
if err != nil {
fmt.Printf("Couldn't persist status to db, %v\n", err)
}
return createdSys, err
}
return system, errors.New("NotFound")
}
func getTlsConfigWithClientCert(system models.Systemstatus) (*tls.Config, error) {
tlsConfig := &tls.Config{}
var ccDecryptErr error
var parseErr error
clientCert, getCCErr := getClientCert(*system.ClientCertID)
if getCCErr != nil {
fmt.Printf("Could not load certificates from db, %v\n", getCCErr)
} else {
// encode private key as pem structure
cert, ccDecryptErr := decryptClientCert(clientCert)
if ccDecryptErr != nil {
fmt.Printf("Error decrypting cert, %v", ccDecryptErr)
} else {
url, parseErr := url.Parse(system.CallUrl)
if parseErr != nil {
fmt.Printf("Could not parse URL to string, %v\n", parseErr)
} else {
serverCerts := getCertFromUrl(*url)
caCertPool := x509.NewCertPool()
for _, sCert := range serverCerts {
caCertPool.AddCert(sCert)
}
tlsConfig = &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: caCertPool,
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
},
PreferServerCipherSuites: true,
MinVersion: tls.VersionTLS12,
MaxVersion: tls.VersionTLS12,
}
}
}
}
err := errors.Join(getCCErr, ccDecryptErr, parseErr)
return tlsConfig, err
}
func DeleteSystem(id int) (bool, error) {
rowsAffected, err := datalayer.DeleteSystem(id)
if rowsAffected > 0 && err == nil {
return true, err
} else {
return false, err
}
}
func GetSystemStatuses() ([]models.Systemstatus, error) {
var err error = nil
statuses, err := datalayer.GetAllSystemStatuses()
if err != nil {
fmt.Printf("couldn't get systemStatuses from db, %v\n", err)
}
return statuses, err
}
func SaveSystemStatus(system models.Systemstatus) (models.Systemstatus, error) {
system, err := datalayer.SaveSystemStatus(&system)
return system, err
}
func checkCert(system *models.Systemstatus) error {
var checkErr error
url, parseErr := url.Parse(system.CallUrl)
if parseErr == nil {
certs := getCertFromUrl(*url)
expirationDate := certs[0].NotAfter
currentDate := time.Now()
alertDays := currentDate.AddDate(0, 0, system.CertExpirationDays)
if !expirationDate.After(alertDays) {
checkErr = fmt.Errorf("certificate will expire in less than %d days, expiration datetime: %v", system.CertExpirationDays, expirationDate)
} else {
system.CertStatus = "OK"
}
}
err := errors.Join(checkErr, parseErr)
return err
}
// var to make it mockable.
// handleResponse: Checks error code, reads body, checks if it matches the ResponseMatch prop of the models.SystemStatus struct.
// returns: a string of anything that went wrong.
var blHandleResponse = handleResponse
func handleResponse(system *models.Systemstatus, resp *http.Response, err error) error {
var respErr, readErr, matchErr error
if err != nil || resp.StatusCode > 399 {
respErr = fmt.Errorf("failed posting to endpoint: %v", system.CallUrl)
fmt.Print(respErr)
} else {
body, readErr := io.ReadAll(resp.Body)
if readErr != nil {
fmt.Print(readErr)
} else {
if strings.Contains(string(body[:]), system.ResponseMatch) {
system.CallStatus = "OK"
system.LastOKTime = time.Now()
if system.AlertHasBeenSent {
sendOKStatus(system)
}
} else {
matchErr = fmt.Errorf("response didn't match expected content")
}
}
}
return errors.Join(respErr, readErr, matchErr)
}